The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
3方差的专业定义是随机变量的二次中心矩,与期望值之差的平方的加权平均值。
2
This paper, firstly, starts with the definition of central bank independence with respect to personnel, financial and policy independence, and points out this definition is in relative terms.